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Composite insulators are widely used in the field of power grid because of their superior performance. At present, due to the increase of the number of birds, the situation of bird pecking composite insulators is becoming increasingly serious, and the insulator structure is damaged after bird pecking, which will cause power grid line faults. Therefore, this paper studies the effect of bird pecking damage on the performance of composite insulators, and provides reference for power grid operation and maintenance management. Firstly, the mechanical and electrical properties of composite insulator after bird pecking were analyzed by experiments. Then, the effects of different damage proportions and different damage number on the surface electric field strength and pollution flashover voltage of composite insulators were studied by artificial simulation of bird pecking umbrella skirt damage. Finally, the electric erosion test, acid immersion test, and thermal ageing test of composite insulator sheath were carried out to evaluate the effect of sheath damage on the properties of composite insulator. The results show that the structure of the composite insulator is damaged after bird pecking, and its electrical properties, mechanical properties, and anti-fouling properties will be affected. At the same time, after the sheath is damaged, under the joint action of many factors such as local field strength, moisture, acid, discharge heat production, and mechanical stress, the core rod material deteriorates and degrades, the mechanical properties of the core rod decrease, and there is a risk of abnormal fracture of the composite insulator.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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